Thread is still failing test_tss_lib, now with this...
../libs/thread/test/test_tss.cpp(181): error in "test_tss": Support of
automatic tss cleanup for native threading API not available

If I understand this correctly, the tss cleanup will never be called for
a thread created via the native API. There's no global function that can
force a clean-up because nothing can force the underlying thread
mechanism to return the thread-specific value for a thread that's
already exited.

I see some subtle magic in libs/thread/src/win32/tss_pe.cpp, some even
for __MINGW32_...

Is this for static libs? Any chance we can make that work for MinGW's
gcc-4.3.3 and gcc-4.4.0?